The cozy will help you keep that second cup warm.
It slides right over the bottom and secures with a button through the handle of the Chemex. It will also fit just fine on the wood collar classic version.
Because it covers the whole bottom it also adds extra protection for the Chemex and whatever surface it is placed on.

This detailed crochet pattern is written in American crochet terms and includes photos of a finished piece.
There are instructions for 6 cup, 8 cup and 10 cup sizes.

Materials required,
• Approximately 50-60g of Aran to Bulky weight yarn
• US I/5.5mm crochet hook
• Removable stitch marker
• Darning needle

Skill level is easy, but you must be familiar with basic crochet stitches and techniques.
Stitches used,
• Ch – Chain
• Dc – Double Crochet
• Sc – Single Crochet
• Sl st – Slip Stitch
• Tr – Treble Crochet